Incandescing m antle for gas-burners



UNITE STATES PATENT. OFFICE.

CHARLES F. ARMINGTON, OF BOSTON, MASSACHUSETTS.

INCANDESCING MANTLE FOR GAS-BURNERS SPECIFICATION formingpart of Letters Patent No. 626,958, dated June 13, 1899.

' Application filed January 27, 1899. Serial No. 703,569. (N 111061610 To all whom it may concern:

Be it known that 1, CHARLES F. ARMING- TON, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Incandescing Mantles for Gas-Burners, of which the following is a description sufficiently full, clear, and exact to enable those skilled in the art to which it appertains or with which it is most nearly connected to make and use the same.

My invention relates to incandescing mantles for gas-lights, and is intended to provide a new and improved mantle of increased durability and efficiency.

Heretofore it has been usual to fold transversely and bunch at the top the material out of which the small folded mantle used in the star-burner is made for the purpose of securing it to a small metal tube or ring which fits over the arm of the star.

After careful investigation and experiment I have invented a mantle in which by departing from the construction heretofore employed I obtain a considerable increase in illuminating power and also in the durability of the mantles.

My improved mantle comprises a single piece of material having thr'ee parallel folds dividing the piece into four longitudinal sections or walls without any transverse fold or bunching at the top.

In its completed form my mantle comprises a single piece of material rolled or folded to form a continuous external wall and having the space inclosed by said wall divided into two tubular compartments by adjacent involute folds or sections and extending substantially from the open to the closed side of the mantle.

An important feature'of my invention consists in the folding of my material in sucha way as to form the two pockets or compartments lying sideby side, each having an opening or escape for the gas at the top.

Another important feature consists in the employment of a supporting and retaining loop of comparatively soft incombustible material passed directly through the fabric in such a way as to form a pliable or yielding support without bunching or closing up the top of each chamber or compartment of the mantle.

Referring now to the drawings, Figure 1 is a view in side elevation of one of my improved mantles suspended in the star-burner ready for use. Fig. 2 is a plan view of the same. Fig. 2 is a side elevation of the mantle detached, showing clearly the supporting and retaining loop. Fig. 3 is a diagrammatic view showing the cross-sectional contour of the lower end of the mantle. Fig. 4 represents the blank or piece of material out of which the mantle is formed, the lines of fold being indicated in dotted lines. Figs. 5, 6, and 7 illustrate the successive stages in the course of folding the piece to form the mantle.

CL designates the blank or piece of material out of which one of the mantles is to be formed. The first step is to turn in the opposite edges, the line of fold in each instance being approximately distant from the edge one-fourth of the whole width of the piece, so that the involuted or folded-in sections a a nearly meet at the middle line of the central section (1 as shown in Fig. 6. folded along the middle line of the section (1 as shown in Fig. 7, so that the two involuted sections lie one upon the other. In this manner the middle section a really forms a continuousexternal wall inclosing within itself an interior chamber open on oneside and closed on the opposite side, while the two involuted or folded sections a form two internal Walls extending from the open to the closed side of the mantle and forming, in connection with the exterior wall, two longitudinal compartments 0 c, separated by the narrow interior space between the two inside walls, which interior space is open toward the flame when the mantle is in use, as is clearly shown in Fig. 3. With the material folded flat, as in Fig. 6, there are four thicknesses or layers of nearly equal size formed by the parallel folds in the fabric. Through these four layers, near the top, I pass a loop d, of soft non-combustible material, such as asbestos, and also a loop 6, which serves to confinev the open sides of the mantle at the The strip is next having 'two infolded sections, subdividing name to this specification, in the presence of said chamber and. leaving the mantle open to two subscribing witnesses, this 24th day of IO freely admit the flame along the side toward J annary, A. D. 1899. the burner, the mantle being closed on the 5 other side, whereby the flame is admitted to CHARLES ARMINGTON and confined in the mantle throughout its WVitnesses: length, substantially as set forth. GEO. N. GODDARD,

In testimony whereof I have signed my ARTHUR VV.-CRO SSLEY.

Patented lune l3, I899.

' H. W. AVERY &. W. S. JUDD.

POST HOLE BIGGER.

' (Application filed Feb. 20, 1899.)

(No Model.)

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